Timing Side-Channel in AES-CCM Tag Verification in AWS-LC
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 7 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-208.
Summary
Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| AWS | AWS-LC | 1.21.0 to before 1.69.0 | 1.69.0 | Patch available | CNA |
| AWS | AWS-LC-FIPS | 3.0.0 to before 3.2.0 | 3.2.0 | Patch available | CNA |
- AWS-LC VendorAWS Affected 1.21.0 to before 1.69.0 Fixed in 1.69.0 Patch available CNA
- AWS-LC-FIPS VendorAWS Affected 3.0.0 to before 3.2.0 Fixed in 3.2.0 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:amazon:aws-lc-fips-sys:*:*:*:*:*:rust:*:* | 0.13.0 to before 0.13.12 | Vulnerable | AWS |
| cpe:2.3:a:amazon:aws-lc-sys:*:*:*:*:*:rust:*:* | 0.14.0 to before 0.38.0 | Vulnerable | AWS |
| cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:*:*:*:* | 1.21.0 to before 1.69.0 | Vulnerable | AWS |
| cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:fips:*:*:* | 3.0.0 to before 3.2.0 | Vulnerable | AWS |
- cpe:2.3:a:amazon:aws-lc-fips-sys:*:*:*:*:*:rust:*:* Versions 0.13.0 to before 0.13.12 Vulnerable ·AWS
- cpe:2.3:a:amazon:aws-lc-sys:*:*:*:*:*:rust:*:* Versions 0.14.0 to before 0.38.0 Vulnerable ·AWS
- cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:*:*:*:* Versions 1.21.0 to before 1.69.0 Vulnerable ·AWS
- cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:fips:*:*:* Versions 3.0.0 to before 3.2.0 Vulnerable ·AWS
Remediation
- Fix · CNA AWS-LC (AWS) Fixed in 1.69.0
- Fix · CNA AWS-LC-FIPS (AWS) Fixed in 3.2.0
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
AWS-LC — aws.amazon.com/security/security-bulletins/2026-005-AWS
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-02881 PKCS7_verify Signature Validation Bypass in AWS-LCPriority MEDIUM 45
- TI-2026-02879 PKCS7_verify Certificate Chain Validation Bypass in AWS-LCPriority MEDIUM 45
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Confidential Compute Attestation | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Update Service | Affected | No fix yet: Fix deferred |
| Red Hat Trusted Artifact Signer | Affected | No fix yet: Fix deferred |
| Red Hat Trusted Profile Analyzer | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-3337
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
Sources
- CVE-2026-3337 · CVE Program
- CVE-2026-3337 · NVD
- FIRST EPSS
- CVE-2026-3337 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences